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GWSS Spread Incident – Update 5/28/2026

This is an active and evolving situation.

For the latest updates, please visit:

https://www.cdfa.ca.gov/pdcp/gwss-costco-plants.html

The California Department of Food and Agriculture’s Pierce’s Disease Control Program (PDCP) is working with Costco Wholesale and county agricultural officials after invasive glassy-winged sharpshooter (GWSS) insects were found on grapevine shipments sold at select Costco locations in Northern California between April 21 and May 19. Costco is not at fault and is cooperating with our response.

Costco Locations that Received Shipments

(as of 5/28/2026 at 1:00 p.m.)

• Alameda County or call 510-670-5232
• Butte County or call 530-552-4100
• Contra Costa County or call 925-608-6600
• Humboldt County or call 707-441-5260
• Kings County or call 559-852-2830
• Marin County or call 415-473-6700
• Mendocino County or call 707-234-6830
• Merced County or call 209-385-7431
• Monterey County or call 831-759-7325
• Napa County or call 707-253-4357
• Placer County or call 530-889-7372
• Sacramento County or call 916-875-6603
• San Joaquin County or call 209‑953‑6000
• San Mateo County or call 650-363-4700
• Santa Clara County or call 408-918-4600
• Santa Cruz County or call 831-763-8080
• Shasta County or call 530-224-4949
• Solano County or call 707-784-1310
• Sonoma County or call 707-565-2371
• Stanislaus County or call 209-525-4730
• Yolo County or call 530-666-8140
• Yuba County or call 530-749-5400

PLEASE SHARE: Social Media Tools

The Pierce’s Disease Control program has created social media graphics and text to share with your community and networks. For access to the design files to add your organization’s logo, please contact pdcpinfo@cdfa.ca.gov or call 916-900-5351.

Graphics

Right-click to download and save the images below.

This is an active and evolving situation.

For the latest updates, please visit:

https://www.cdfa.ca.gov/pdcp/gwss-costco-plants.html